Tank



FIG. 1 is a top perspective view of the tank;

FIG. 2 is a bottom perspective view of the tank;

FIG. 3 is a front elevational view of the tank;

FIG. 4 is a rear elevational view of the tank;

FIG. 5 is a left side elevational view of the tank;

FIG. 6 is a right side elevational view of the tank;

FIG. 7 is a top plan view of the tank; and,

FIG. 8 is a bottom plan view of the tank. 

CLAIM The ornamental design for a tank, as shown and described. 